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Re: Problem 4
Posted:
Apr 25, 2005 10:51 PM


Cramer's Rule is not used on a computer to compute the solution vector, because the operation count is very^3 high!
However,  to compute nxn matrices where n is less than 4 or 5 or  if one wants to compute only one of the coefficients of the solution vector or  the matrix has a parameter(s) in it or  on a test
then Cramer's Rule makes some sense!
I tell linear algebra students that linear algebra is only addition and multiplication; however, if you find you are doing many computations on an exam to get the answer, it "usually" means that you are not using any of the nice theory that you learned in the course!
 Regards, Casey



